package main

import (
	"fmt"
	"math"
)

func main() {
	const a = 55 // 允许
	//a = 89       // 不允许重新赋值
	fmt.Println(a)

	fmt.Println("Hello, playground")
	var a1 = math.Sqrt(4)   // 允许
	fmt.Println(a1)
	//const bq = math.Sqrt(4) // 不允许
}